Images used for most tests:
    pot.tga             249 x 299
    tree.tga            172 x 180

Image used for command WarpFunct:
    warpTree.tga        128 x 256
    warpTreeAlpha.tga   128 x 256

Image used for command Stamp:
    logo.tga            100 x 100

Images used for command DrawBrush:
    keksi.bsh            50 x  50
    star.bsh             50 x  50

Images used to generate above brush files (see makebrush.tcl):
    keksi_bsh.rgb        50 x  50
    star_bsh.rgb         50 x  50

Colorbar images:         512 x 512
    - Available in SGI and Targa format.
    - RGB and RGBA in uncompressed and RLE compressed format.
    - 8 colorbars from left to tight: gray, yellow, blue, green, magenta, red, blue, black 
    - The alpha (matte) channels of RGBA images have 4 regions with differing values:
        (0,   0, 511,  99): Transparency value 0.1 ( 26)
        (0, 100, 511, 199): Transparency value 0.5 (128)
        (0, 200, 511, 299): Transparency value 0.0 (  0) (totally transparent)
        (0, 300, 511, 511): Transparency value 1.0 (255) (totally opaque)

